Expansion-bolt



I. C. LOVINGTN..

EXPANSION BOLT.

APPLICATxoN FILED JUNE 16. 1919.

Patented Man 29, H2L

In van Zlaf: Jmh @Lavzgom NETE@ STATES EXPANSION-BOLT.

Lerares.

Specification of Letters Patent.

rarement iti-ar. as, resi.

Application tiled June 16, 1919. Serial No. 304,527.

To all whom z' may concern:

Be it known that I, JOSEPH C. LoviNG'roN, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Expansion-Bolts, of which the following is a speciication.

rThis invention 4relates to expansion bolts and its object is to provide a device of the character specified of simple construction and reliable in operation. To these ends my improvements comprise features illustrated inv their preferred embodiment in the accompanying drawing, wherein Figure l is a plan view of one of the eX- panding members. Fig. 2 is a front elevation of the whole device, a portion of the members being shown in section. Fig. 3 is a transverse cross-section on line 3-3 of Fig. 2, with the bolt and lower member omitted. Fig. 4 is a fragmentary sectional elevation similar to a portion of what is shown in Fig. 2 and illustrating one feature of operation. All the figures of the drawing are to one scale.

Opposite, coaxial, expansion members 2 and 4 each have an axial lio-le therethrough for the passage of bolt member 5. The hole through upper member 2 is sufficiently large to permit the free passage of said bolt, and the hole through lower member 4 is threaded to engage the threaded portion of said bolt. IWhile said members 2 and 4 may be of other peripheral configuration, they are preferably conical, and arranged with their smaller ends facing each other. 'Also the peripheral surfaces of said expansion members are preferably corrugated, as at 13 in Fig. l, which may be a top plan view of member 4 or a bottom plan view of member 2. Said members 2 and 4 are further provided in their outer ends with pockets or grooves 6, comprising seats for the reception of means for temporarily holding said expansion members against other members lying therebetween. Said means may comprise a wire tie member 7, having its ends bent into hook formation for engagement with said seats 6 respectively. Said wire tie may be provided in plurality if desired.

Arranged radially about bolt member 5 are a plurality ofjaws 8, 8, positioned between expansion members 2 and 4 and each having their inner faces 9 of convex formation. The upper and lower ends of said ini ner faces are located from bolt 5 a distance slightly beyond the smaller end of either member 2 or 4 from said bolt, so that as said members are forced toward each other those smaller ends will be effective for entering between said bolt and the ends of said jaws respectively. Said jaws preferably have serrated outer edges l0 for engaging the wall of any cavity within which the device is placed for use. Said jaws are further provided with seats at their opposite ends for the engagement of suitable means for temporarily retaining said jaws in predetermined radial positions. Said seats may comprise protrusions similar to one or more of teeth 10, but I preferably cut notches 1l in said ends into which is seated adjacent portions of carrier l2. Said carrier l2 is preferably of annular form and has mortises through its cylindrical wall in which jaws 8 are carried. Said carrier 12 may be made of any of a variety of suitable plas tic or frangible deformable materials such as wood, molded composition, or some metal such as lead. Its function is to support tem- 2, 4, when drawn toward each other by bolt 5, will engage the inner faces 9 respectively of said jaws and force those jaws radially outwardly. In addition to the function of bringing jaws 8 into gradual engagement with the opposing walls of any cavity in which my improved device may be employed, convex inner walls 9 are also efficientito enable the outer toothed faces 10 of said jaws to accommodate themselves to tapered or irregular shaped holes, as those convex walls may ride up farther on the conical face of one of members 2 and 4 than on the other thereof, thereby rocking said jaws'into canted position, as shown in Fig. 4. The corrugations in the conical walls of members 2 and 4 are efficient to maintain carrier 12 and jaws 8 against twisting when said expanding -members are drawn toward each other.

I claim:

1. In an expansion bolt, the combination of opposite coaxial members each having an axial hole therethrough, a bolt`adapted for drawing said opposite members toward each other, a plurality of jaws radially arranged about said bolt between said opposite members and plastic means for temporarily maintaining said jaws in position.

2. In an expansion bolt, the combination porarily in position jaws 8 so that members of opposite coaxial members each having an axial hole therethrough, a bolt adapted for drawing said opposite members toward each other, a plurality of jaws radially arranged about said Kbolt between said opposite nieinbers, each of said jaws having its inner face of convex formation lengthwise, and plastic means for temporarily maintaining said jaws in position.

3. ln an expansion bolt, the combination of opposite coaxial conical members each having an axial hole therethrough, a bolt adapted for drawing said opposite members toward each other, a plurality of jaws radially disposed about said bolt between said conical members and adapted to be forced radially outwardly by and as said conical members approach each other, and plastic means :tor maintaining said jaws in position.

e'. ln an expansion bolt, the combination of opposite coaxial expanding members, a plurality of radially arranged jaws adapted to be forced outwardly by said expending members as those members approach each other, means for drawing said expanding members toward each other, means for teinporarily maintaining` said jaws in position to be engaged by said expanding members, a

seat in the outer end oit' each eX aandino t! member, and means engaging said seats for temporarily holding said expanding mem bers and jaws in coacting'- relation.

5. ln anl expansion bolt, the combination of a bolt, opposite expanding members, one slidable on said bolt and the other in threaded engagement with said bolt, said expanding members having conical outer surfaces tapering toward each` other respectivel a plurality of jaws radially arranged about said bolt and having the extremes of their inner edges in a circle oi greater diameter than the diameter of the small ends respectively of said expanding members, and

lplastic means for temporarily maintaining` said jaws in position to be actuated radially 'of said bolt by said expanding members.

respectively,

' notches, respectively. l v

6. In an expansion bolt, an annular shaped carrier oi2 deformable material, having a mortise through its cylindrical wall, a

jaw in said mortise, and coacting means'on jouter face and having its inner face of convex formation lengthwise and having means :it its ends ior engaging said carrier. p

9. in an expansion bolt, a plastic carrier,

a jaw having aninner face of 'convex formation lengthwise andY having Vmeans at its opposite ends for engaging said carrier.V

"110.ln an expansion bolt, an annular soaped carrier having a mortise through its cylindrical wall, a jaw 'n said mortise, ka seat in each end oi' said jaw, land means Aat each end of said'mortise for engaging said seats, for maintaining the relation of said carrier and jaw. ll. ln an expansion' bolt, an annular shapedrv plastic vcarrier having nioitises 'through its Vcylindrical vwal/l, a plurality of jaws carried in said mortises, respectively, and coacting means on said jaws and carrier for temporarily retaining said jaws in posi* tion in said carrier. l.

l2. ln an expansion bolt, an annular sliaped'carrier having mortisesthroiigh its `cylindrical wall, a plurality of jaws in said mortises, respectively, notches in the opposite ends oi each of said jaws, and adjacent portions of said carrier seated `in said ln witness whereof, Ifhereby nature this 13th day of June, 1919. I JOSEPHC. LOVINGTON.

aiiix my sig- 

